Marywenttotheboxofficeatlunchtime,butallthetickets

問題詳情：

Mary went to the box office at lunch time, but all the tickets_______out.

A. would sell　　　　　B. had sold　　　　 C. have sold　　　　　D. was selling

【回答】

B

知識點：過去完成時及其被動式

題型：選擇題